A multistage cache in the 2018 NoVaGo Survivor Series testing both your mental and physical determination. Nothing out of the reach of an agile resourceful cacher, but perhaps out of one's comfort zone.
Some words of caution to ensure your fun, to assume these risks, you are the one.
You should not do this in the rain, this walking through a giant drain.
You should not do this on your own, and take more lights than just your phone.
Better still, please bring a friend, to brave this passage, beginning to end!
Stage One -- you will search for a bison-tube sized container that will give you the coordinates for the next stage.
Stage Two -- nothing to find here except the entrance to the underworld. Not quite in plain sight, and mostly out of mind for the passers by.
Move carefully to reach the entrance, keeping your eyes open for Cerberus and the thorny plants that guard the access. Solo trips are possible, but not recommended. Your journey through the darkness to the cache may take you half an hour or more.
Carry more than one source of light, not counting the flash on your phone, because you will be travelling in darkness for most of your journey. Speaking of your phone, consider putting it inside a plastic Ziplock bag. Terrain in the underground is mostly predictable, likely wet, perhaps slippery, and you might be creeped out by the sounds of the Harpies as they incessantly swarm overhead.
If you persevere you will reach a point where you have to step up your game, and do so cautiously. The passage is smaller, but easily traversed walking upright, but use care not to bump your head on the top of the passage.
You eventually reach a larger area where multiple paths converge. The main path you have followed continues on into the void for quite a distance, but your quest is near its end. You should journey from this Convergence to an Emergence on your left where you can look for the final container that is larger, higher, and lower than the one you found at stage one. Your journey back will retrace the route you used to reach the cache.
PLEASE MAKE SURE THAT YOUR CACHE LOG MATCHES YOUR ON-LINE LOG, SINCE THESE ARE PERIODICALLY REVIEWED FOR CONSISTENCY.